Arisaema triphyllum (L.) Torr., being a dioecious pliant with a considerable percentage of intermediate individuals, presented itself to the writer's mind as a very favorable plant for experiments on the control of sex, such experimental control seeming to be necessary to substantiate conclusions reached previously, mainly from taxonomic studies, as to the fundamental nature of the sexual state.Accordingly, work was begun on this plant in the spring of 1917.More recently work has also been done on Arisaema Dracontium (L.) Schott.The first plantings were made in pots and were not very satisfactory, probably because there was no place in the greenhouse to keep them properly, and the writer was absent during the entire winter.However, one pure carpellate plant changed to a pure staminate plant, and some intermediate individuals also changed to the staminate condition.'The writer was certain, therefore, that sex reversal took place, and the results so far as they went agreed with the reports of sex reversal in Arisaema by Atkinson (1), Gow (2), and Pickett (3).The study was continued by observations in the field and by experiments in garden plots.
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John H. Schaffner (1922) studied this question.